Its a nice thought but total BS.
The best thing for the Sahara Desert would be for MORE CO2.
Plant life needs carbon and sunlight to turn the carbon into food. Plants use water to move products around like we use blood. When there is not enough CO2 plants will extract carbon from by again using sun power to burn the oxygen in the water and make carbon for food. During the last ice age the Carbon Dioxide level in our atmosphere dipped below 300 parts per million. That is a dangerous level and could have extinguished all life on the planet had it gone much lower. Some scientists believe that if the level drops below 250ppm most plant life will die. Without plant life we all die.
In the 1970s we were told by scientists that the Sahara Desert was growing but now suddenly it is retreating. The cause is the nearly 400PPM of Carbon Dioxide in the atmosphere, it is negating the lack of water in the Desert and allowing plants to thrive where they could not before.
It is true that if you could bring water to the Desert you can make it green but it is much easier to increase Carbon Dioxide. Florists green houses pump in Carbon Dioxide to increase growth. The added benefit of added CO2 is added Oxygen. The added plants in our ecosystem will produce oxygen that was not being produced but burned before.
Carbon is good, the staff of life.
I think we should shoot for the optimum, 1500 ppm.
Four-fold increase.
Nothing but the best for Mother Earth.
Stomata count of plants is reverse correlation of CO2 concentration. Water loss directly correlated with Stomata in leaf surface. High CO2 practical result is less water loss from plants. Plants survive arid conditions better with increased CO2.